Drug interactions
Ferrous sulfate + Sodium sulfate / ?magnesium sulfate / potassium chloride
Severity: Minor
Ferrous sulfate and Sodium sulfate / ?magnesium sulfate / potassium chloride: minor interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
The oral sulfate-based bowel preparation contains magnesium, which can bind oral iron in the gut and lower the amount of iron absorbed. Iron therapy may therefore be less effective around the time of bowel cleansing.
What this interaction means in plain words
Ferrous sulfate and Sodium sulfate / ?magnesium sulfate / potassium chloride have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Magnesium cations chelate or bind iron in the gastrointestinal lumen, reducing iron absorption.
What to do
Give oral iron at least 2 hours before and at least 6 hours after each dose of the bowel preparation. Alternatively, hold iron on the day of bowel preparation.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Ferrous sulfate
Frequently asked questions
Can I take Ferrous sulfate with Sodium sulfate / ?magnesium sulfate / potassium chloride?
MediHelp rates the interaction as minor. Ferrous sulfate and Sodium sulfate / ?magnesium sulfate / potassium chloride have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. The oral sulfate-based bowel preparation contains magnesium, which can bind oral iron in the gut and lower the amount of iron absorbed. Iron therapy may therefore be less effective around the time of bowel cleansing.
How serious is the interaction between Ferrous sulfate and Sodium sulfate / ?magnesium sulfate / potassium chloride?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Give oral iron at least 2 hours before and at least 6 hours after each dose of the bowel preparation. Alternatively, hold iron on the day of bowel preparation.
What other medicines interact with Ferrous sulfate?
MediHelp also lists interactions of Ferrous sulfate with, for example, Ciprofloxacin, Dimercaprol, Acetohydroxamic acid. The full list is on the Ferrous sulfate page.
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